Why Is My Electric Bike Motor Cutting Out? (8 Reasons And Fixes!)

Electric bikes are a great alternative to traditional bicycles, providing an easier way to get around town without having to work up a sweat.

However, it can be a hassle and inconvenient when your electric bike motor starts cutting out.

This troubleshooting guide will look at some of the possible causes of this problem and provide simple solutions so you can get back on the road in no time.

What are e-bikes?

  • Electric bikes, or e-bikes, are a type of bicycle that uses a battery-powered electric motor to help the rider pedal.
  • They come in various styles, from mountain and commuter to cargo bikes.
  • E-bikes are popular among commuters because they can help riders travel farther and faster than they could on a regular bike.
  • Some models even have a throttle that allows the rider to get up to speed without pedaling.
  • E-bikes can also be helpful for people who are new to biking or who aren’t in great shape.
  • They provide some assistance so the rider doesn’t have to work as hard and can make it easier to tackle hills and other obstacles.

8 Possible Reasons Why Your Electric Bike Motor Cutting Out

Electric bikes are a great way to get around, but sometimes the motor will cut out for no reason.

This can be pretty frustrating, especially if you’re in the middle of a busy street and your bike stops working.

What could be the problem with your e-bike?

Here are a few reasons why your electric bike motor might be cutting out and how to fix it.

1.    Loosened Prongs

Electric bike motors are powered by electricity that is stored in a battery. The battery is connected to the electric bike motor by two metal battery prongs.

When these prongs are loose, they can create a poor connection between the battery and the electric bike motor. This can cause the electric bike motor to cut out.

If you find that your prongs are loose, you can quickly tighten them up using a pair of pliers.

Once you’ve tightened up the battery prongs on your electric bike motor, you should test it out and see if the problem has been fixed.

If the problem persists, there may be something else wrong with your electric bike motor, such as:

2.    Loosened Throttle

One of the main controls on an electric bike motor is the throttle. The throttle controls how much power goes to the motor and can be used to adjust the bike’s speed.

There are two types of throttles: thumb throttles and twist throttles.

Thumb throttles are activated by squeezing a lever with your thumb, while twist throttles are activated by twisting a grip with your hand.

Some bikes have both types of throttles, while others only have one.

But one problem that can occur with the throttle is it becomes loose. When this happens, it can’t provide enough power to the motor, which causes it to stall.

And if this happens frequently, it can damage the motor and shorten its lifespan.

One way to fix this problem is to tighten the throttle using a screwdriver. If you have an Allen wrench, you can also use that to tighten the throttle.

Another way to fix this problem is using zip ties or electrical tape around the throttle. This will help keep the throttle in place and prevent it from becoming loose again.

3.    Motor Connection Issues

If you’re experiencing problems with your electric bike motor, it’s possible that the motor inhibitor is not well-engaged.

This safety feature is designed to keep the motor from running if the bike moves too quickly.

To check if the inhibitor is engaged, hold your hand against the front wheel and try to spin it. The inhibitor is likely engaged if you can’t spin the wheel easily.

Otherwise, you may need to adjust the settings or take your bike in for service if it’s not well-engaged.

It’s also possible that your electric bike motor is overheating. When an electric bike motor is overheating, it will eventually cut out to protect itself from further damage to the motor.

Overheating is usually caused by many factors, including riding in hot weather, using the motor for extended periods, or riding up steep hills.

In most cases, replacing the damaged motor is the most effective way to fix this problem.

4.    Failing Sensors

Sensors are responsible for reading and transmitting data to the motor controller. There are several different types of sensors, each with its specific purpose.

One standard sensor is the pedal sensor, which reads how much pressure is applied to the pedals to determine how much power to send to the motor.

If this sensor fails, the electric bike will either not move or move very slowly.

Another common sensor is the speed sensor, which tells the controller how fast the bike moves so that it can adjust the power accordingly.

When these sensors fail, the electric bike motor might not produce enough power to ride, which can cause it to cut out.

Luckily, there are a few things you can do to fix a failing sensor.

The first is to clean the sensor by using a cloth or brush. Often, dirt and debris can build up on the sensor and interfere with its ability to communicate properly with the electric bike motor.

If cleaning the sensor still doesn’t work, you can try replacing it.

5.    Malfunctioning Controller

The controller is responsible for taking the input from the throttle and sending it to the motor, so if it’s not working correctly, the bike will stop.

There are several ways to test whether or not the controller is at fault:

One way is to take the battery out of the bike and spin the wheel. If the wheel spins freely, then the controller is likely not at fault.

Another way to test is to unplug the throttle and see if the motor still runs. If it does, the problem is likely with the throttle; if it doesn’t, it’s probably with the controller.

If you think the controller might be malfunctioning, try replacing it with a new one.

6.    Faulty Pedal Assist Detector

The pedal assist system is responsible for telling the bike’s motor when you are pedaling, and it can sometimes fail or become dirty. This can cause the motor to cut out or not work properly.

In some cases, the detector may even send false signals to the motor, causing it to run unnecessarily and drain your battery.

If your electric bike’s motor keeps cutting out, you should first check the pedal assist detector to make sure it is functioning correctly. If it is not, you may need to clean or replace it.

7.    Dead Battery

Electric bike batteries lose power over time and eventually die altogether. This can be caused by several things, including leaving the light on or using the bike for too long without recharging it.

If you think your battery might be the culprit, try charging the battery for a few hours and see if that fixes the issue.

8.    Broken Brake Levers

When the brake lever isn’t working correctly, it can cause the e-bike motor to stop abruptly.

This is because the brake lever is responsible for sending a signal to the electric bike motor that tells it to stop. When this signal is interrupted, the electric bike motor will stop running.

One way to determine whether or not your brake lever is causing your electric bike motor to cut out is by gently pressing on the brake lever while the electric bike motor is running.

If the electric bike motor cuts out when you do this, then it’s likely that your brake lever is broken and needs to be replaced.

Final Thoughts

If you’re an e-bike rider, you know the dreaded feeling of your electric cutting out while you’re in the middle of a ride.

This is most likely due to one of the common e-bike problems listed above: loose wire or connections, failing bike components, and issues with brake levers.

But don’t worry; with a bit of troubleshooting, you should be able to get your e-bike back up and running again!


How Long Do Electric Bicycles Last?

That depends on the quality of the electric bicycle. A good quality electric bicycle should last for several years. However, it may only last for one or two years if it’s not a high-quality bike.

How Do I Prevent My Electric Bike Motor From Overheating?

The most important thing you can do is ensure your bike has enough airflow. Be sure to keep the motor clear of debris and the fan blades clean so they can spin freely.

You should also avoid riding in hot weather or traffic jams, where the motor will work harder than usual and could overheat.

How Do I Know If My E-Bike Battery Is Bad?

You can check the battery health by using a battery tester tool. This will tell you how much life is left in your battery and whether or not it needs to be replaced.

Thomas Kersten

Hi, I am a passionate biker, and I have been riding for more than ten years and share my biking tips and tricks with the world. I've tested more than 300 bikes.

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